Nicholas W. van Aelstyn

PartnerCo-Leader, ESG and Sustainability Team
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Nicholas van Aelstyn

Overview

Nicholas van Aelstyn is an environmental lawyer who advises clients on both traditional environmental matters as well as matters related to climate change. He is leader of the ESG and Sustainability team.

Traditional Environmental Counsel

For more than 25 years, Nico has counseled clients on traditional environmental compliance, including the regulation of soils, air and water, and products. Related to this work, he has done environmental due diligence for a wide variety of real estate and corporate transactions, with special expertise in the renewable energy development projects.

Nico also handles litigation related to environmental issues, including cost recovery actions, regulatory actions, writ proceedings to challenge regulations, and representation of potentially responsible parties (PRPs) and PRP groups at Superfund sites. He has particular expertise with contaminated sediment sites.

Climate Change Counsel

Nico’s climate change practice encompasses California’s Cap-and-Trade Program and other aspects of AB 32, as well as other climate programs under the California Air Resources Board (CARB) such as the low carbon fuel standard (LCFS), programs regulating high global warming potential hydrofluorocarbons (HFCs), carbon capture utilization and sequestration (CCUS) and related state, federal and international programs.

His climate finance practice includes handling complex U.S. and international offset transactions in both compliance markets and voluntary carbon markets (VCM), market advice, ESG counseling and addressing clients’ needs with respect to climate disclosure requirements and related climate finance risks.

Nico has represented clients in every lawsuit filed to date challenging California’s Cap-and-Trade Program. His broad litigation experience also includes commercial, real estate, intellectual property and appellate cases. He has handled matters in state and federal courts across the country, including the U.S. Supreme Court and various administrative fora.

In his free time, Nico is an avid cyclist. He competed in the 1,200-kilometer Paris-Brest-Paris races in 2003 and 2023.

Experience

Climate Change. Nico advises clients on a host of issues relating to climate change issues, particularly those in California. Representative matters include:

  • Representing the International Emissions Trading Association (IETA) as an intervenor defendant in the US’s constitutional lawsuit challenging California’s agreement with Québec linking their two emissions trading programs, v. California, No. 2:19-CV-01242 (E.D. Cal.) (California and IETA prevailed on summary judgment and the case is pending before the Ninth Circuit);
  • Advising investors in the carbon market established under California’s Cap-and-Trade Program;
  • Advising companies with respect to California’s Climate Disclosure Laws and more generally regarding a range of ESG (environmental, social and governance) issues, risks and opportunities ;
  • Represented one of California’s largest clean energy providers with respect to all aspects of California’s Cap-and-Trade Program, engaging regularly with senior California Air Resources Board (CARB) officials regarding rulemaking and related issues;
  • Represented coalitions of trade groups and industrial entities in rulemakings with respect to CARB’s Cap-and-Trade Program;
  • Represented multiple manufacturing entities with respect to disputes concerning the GHG emission benchmarks that CARB established for their respective industrial sectors and related issues under AB 32;
  • Represented landowners in forest offset project agreements (both development and offtake), including numerous transactions representing over $300 million and many millions of offset credits;
  • Represented forest carbon project developers with respect to novel, forward carbon credit offtake agreements, and also w/r/t project-specific issues with CARB;
  • Represented an NGO in a large project with the Green Climate Fund to develop REDD+ capacity;
  • Represented IETA and others as intervenors in the lawsuit challenging California’s offsets program, Our Children’s Earth Foundation v. California Air Resources Board (2015) 234 Cal.App.4th 870;
  • Prepared an amicus brief for IETA and others in the lawsuit challenging California’s GHG emission allowance auctions, California Chamber of Commerce, et al. v. California Air Resources Board, (2017) 10 Cal.App.5th 604 (the Court’s decision reflected the argument of our brief);
  • Advising numerous clients with respect to regulatory compliance issues under both state and federal greenhouse gas regulatory programs.

CERCLA. Nico represents individual PRPs and serves as common counsel for PRP groups at several state and federal Superfund sites. He has negotiated settlements with state and federal regulatory agencies, as well as other PRPs. He also has handled allocation disputes and other internal PRP group issues. Nico has experience with all manner of Superfund sites, including large contaminated sediment sites, regional groundwater plume sites, waste disposal sites, drum reconditioning facilities and various other industrial facilities. Several of these involve natural resource damages (NRD) claims by federal and state natural resource trustees. These sites require comprehensive strategies that address remediation and NRD issues and their intersections with allocation issues. Sites at which Nico is or has recently been active include:

  • Yosemite Slough Superfund Site, San Francisco, CA (EPA Region IX; its only active sediment site): have been serving as common counsel for the PRP group at the Site since the outset in 2008; led the effort to negotiate an EE/CA with EPA for this removal action; negotiated an Interim AOC with EPA for the performance of pre-design technical studies; handling negotiations with other PRPs, including several governmental entities, and participating in an ADR allocation process;
  • Portland Harbor Superfund Site, Portland, OR (EPA Region X): have been representing PRPs at this large, complex sediment site since 2006, from before EPA’s issuance of 104(e) information requests through private party cost recovery litigation, the development of an extensive ADR allocation process with approximately 100 PRPs, a PRP group’s performance of the RI/FS, EPA’s issuance of the ROD, and a 2020 AOC for the performance of remedial design at one portion of the river; actively representing a PRP in the allocation process;
  • Lower Duwamish Waterway Superfund Site, Seattle, WA (EPA Region X): large, complex sediment site; represented a PRP in the PRPs’ extensive ADR allocation process;
  • Cooper Drum Superfund Site, South Gate, CA (EPA Region IX): counsel for several PRPs working with others in a group under a CERCLA Section 106 order; negotiated an allocation amongst the PRPs, both in and outside of the group; negotiated a consent decree settlement with EPA; representing a PRP in the implementation of the cleanup under the consent decree settlement;
  • Davis Chemical State Superfund Site, Los Angeles, CA (Cal. DTSC): former solvent recycling facility; common counsel for PRP group that performed RI and prepared RAP; negotiated a consent decree settlement many years later after DTSC renewed enforcement, and defended that settlement successfully in the Central District of California and the Ninth Circuit Court of Appeals; and
  • Casmalia Resources Superfund Site, Santa Barbara County, CA (EPA Region IX): disposal site; common counsel for small PRP group and coordinating counsel for larger PRP group; negotiated favorable settlements.

Contaminated Property Litigation. Nico represents property owners and tenant operators in cost recovery lawsuits regarding contaminated property in state and federal courts. These have included cases concerning a variety of contaminants (VOCs, petroleum products, etc.) and types of property (shopping malls, industrial and rural properties). One extensively litigated case concerned a dispute between the owner of the fee estate and those holding the oil and gas interests. Nico successfully negotiated settlements in all of these matters.

RCRA Disputes. Nico represented a government contractor in disputes regarding the handling of hazardous wastes generated by Naval vessels.

Brownfields Redevelopment. Nico has handled the conversion to productive use of numerous properties with complex environmental issues. He negotiated some of the first prospective purchaser agreements (PPAs) in the country, which concerned the conversion of former disposal sites to retail use.

Other Environmental Matters. Nico represents clients in a wide variety of other environmental regulatory matters, environmental due diligence for renewable energy projects as well as corporate transactions and lawsuits. These have included numerous large scale wind solar projects across the U.S. and complex transactions concerning multiple facilities with contamination issues. He’s also represented clients in lawsuits concerning enforcement actions under the Clean Water Act and the applicability of U.S. dolphin-safe tuna fishing statutes to U.S. citizens on foreign-flagged vessels.

Credentials
Education

J.D., University of Oregon, 1990, Order of the Coif, Associate Editor, Journal of Environmental Law & Litigation

B.A., Williams College, 1986

Admissions

California

Washington, D.C.

California Supreme Court

U.S. District Court, Northern District of California

U.S. District Court, Central District of California

U.S. District Court, Eastern District of California

U.S. Court of Appeals for the Ninth Circuit

Supreme Court of the United States

Circuit Court for Jefferson County, Alabama

U.S. District Court, Northern District of Alabama

U.S. District Court, District of Utah

Honors

Chambers USA, Leading Lawyer, Environment, 2023-2025

The Legal 500 US, Environment Litigation, 2018-2019, 2021-2025

Chambers USA 2025_Nico van Aelstyn
Legal 500 Recommended Lawyer 2024
Legal 500 Recommended Lawyer 2025
Nicholas van Aelstyn - Chambers 2024
Memberships

ABA (Section of Environment, Energy and Resources (SEER))

Bar Association of San Francisco

Thought Leadership
  • UNFCCC COP29 in Baku, Azerbaijan
    "North America Carbon Market & Cooperation Round-Up,"
    IETA Business Hub, November 14, 2024
  • "Determining Materiality for Financial Reporting," EPRI Technical Workshop re GHG Emissions Accounting, November 7, 2024
  • "North America Carbon Market & Cooperation Leadership Dialogue," IETA Business Hub, UNFCCC COP28 in Dubai, United Arab Emirates, November 30, 2023
  • “Lawyers’ Roundtable on Carbon Markets & Claims: EPA Power Plant Proposal, Green Claims, Commodity Futures Trading Commission (CFTC),” IETA North America Climate Summit 2023, New York City, NY, September 20, 2023
  • “Greenwashing, Causation and Collusion – Climate Change and Litigation in the Spotlight,” paper prepared for panel at The Foundation for Natural Resources and Energy Law (FNREL) Institute on International Mining and Energy Law, Development, and Investment, Mexico City, April 21, 2023
  • "Digital Trends: What Are They and What Role Can They Play in the Climate Crisis?," 2023 North American Carbon World, Anaheim, CA, March 23, 2023\
  • “New Standards for Environmental Diligence: What they Mean for Prospective Owners, Operators & Investors,” Webinar presented by Sheppard Mullin, February 7, 2023\
  • “PFAS & Real Property Transactions: The Essentials of Diligence and Compliance,” Webinar presented by Sheppard Mullin and SLR, June 9, 2022
  • "IETA Business Hub," UNFCCC COP26 in Glasgow, United Kingdom, November 2021
  • "IETA Business Hub," UNFCCC COP25 in Madrid, Spain, December 2019\
  • "Surviving Allocation - Tips & Sanity Maintenance Approaches for Superfund Counsel," ABA Section of Environment, Energy, and Resources Webinar, February 14, 2018
  • "IETA Business Hub," UNFCCC COP16 in Cancun, Mexico, December 2010
  • Getting the Deal Through: Climate Regulation 2017 - U.S. Chapter, Law Business Research, Getting the Deal Through - Climate Regulation, January 1, 2017
  • Getting the Deal Through: Climate Regulation 2016 - U.S. Chapter, Law Business Research, Getting the Deal Through - Climate Regulation, January 1, 2016